Here's another wonderful Wes Wilson postcard (there was also a poster version of this), from December of 1966, for three shows at the Fillmore Auditorium in San Francisco. Unlike the poster and handbill, this postcard is considered a reprint because it was printed after the fact, probably in early 1967. Grateful Dead are the headliners, with Big Mama Mae Thornton, one of Janis Joplin's heroine's, getting second bill.

According to the Eric King Collector's Guide, the bible for this sort of thing, my postcard is BG-41-RPC-E because it has a "Creative Litho" credit on the reverse.